Hello Nicu,
we can set up Open ID authentication for access directly to 1C itself. In this case, one of the 1C databases acts as the Open ID of the provider (or server), and the remaining 1C databases act as the Open ID of clients.
The user enters his credentials only once, to access the first 1C. And access to the second 1C occurs automatically.
If you mean this process, then yes, it is possible.
But if you mean access to HTTP services using OpenID authentication, then as far as I know, this is impossible.